What is 21 jewels?

As for the referenced watch above (Seiko 5 Snk809), which has one of Seiko´s highly used and robust movements (the 7S26), there are 21 jewels inside. read more

21 Jewel Movement Explained 21 jewel movement watches are at the very core of the best Swiss watches, but many people have trouble understanding what they are and what their function is. However, it is much easier to understand than most people think. read more

If it says 21 jewels, then there are 21 jewels inside all the pivot/frictional points. Depending on the watch design, the amount of jewels can differ. So yes you could have a watch with 30 jewels, but it would then be more complicated than necessary. read more